1. D. Lorimer, Binary and millisecond pulsars at the new millennium, 2001, Available: 〈http://relativity.livingreviews.org/Articles/lrr-2001-5/〉.
2. A statistic for describing pulsar and clock stabilities;Matsakis;Astron. Astrophys.,1997
3. The Use of Variable Celestial X-ray Sources for Spacecraft Navigation;Sheikh,2005
4. Determination of inter-satellite relative position using X-ray pulsars;Feng;J. Zhejiang Univ. Sci. C,2013
5. J. Sala, A. Urruela, X. Villares, R. Estalella, Feasibility study for a spacecraft navigation system relying on pulsar timing information, in: Proceedings of the European Space Agency Advanced Concepts Team ARIADNA Study, 2004.